I went to our local discount store and bought a pair of HUGE, ugly frameless (important for peripheral vision) circa 1970 amber tinted glasses with tiny little jewels on the temples for $3.99. My husband calls them my "JLo" glasses. They have so far been about 700 miles with me, and although I have dropped them, stepped on them, "lost" them, and abused them in every way, they have stood the test of time. AND, much to my joy, they are great for night riding!

In the same store (Ocean State Job Lot) you can get clear Safety glasses for a few bucks. I think I'll get some as back-up.